With all your good intentions, which are great that you have a goal, you need to be aware that due to your age, you will have some trouble finding clients, even if you DO have the skill to break a horse. There are plenty of experienced breakers/trainers that have been in the business for more than double your time on earth, with a wealth of experience in working with various horses. Unfortunately training a foal and a couple of green horses doesn't make you a professional trainer - to become known in the horse world as a reputable trainer, you will need to train and break numerous horses before you'll even get a look in. All horses are different, and you might be lucky with the foal and have a very quiet, trainable one. But if a client sends you something that is genuinely dangerous and a very big challenge, you will lack the experience to deal with it.
I would advise that you keep honing and building on your skills, work with multiple horses, spend as much time as you can with reputable trainers and when you've got that experience, start offering your services. And I'm talking years - like when you're in your 20's.